factor graphics with pca in R?

Dear R users, 
I need to know whether the factor graphics with principal component analysis are implemented in R. I mean the graphs where the variables are represented in a correlation circle, as described in more detail in this document: 
http://www.unesco.org/webworld/idams/advguide/Chapt6_4_3.htm

It is not a pain to program it myself, nevertheless it would be a waste of time
 if it is already implemented in R. 

Regards, 
Martin